Are you sure that the bool() part is meant to contain parentheses and not square brackets?

If it was declared with square brackets as FunctionName(bool[] args) then that would mean that there's a method called FunctionName which takes a single argument called args, and that argument must be an array of bool values.

If this is meant to be a method declaration then it would also need a return type. For example, string FunctionName(bool[] args) or void FunctionName(bool[] args) etc.